Preview command: move stop default from button to command

package.json

@@ -1,7 +1,7 @@
 {
   "name": "grapesjs",
   "description": "Free and Open Source Web Builder Framework",
-  "version": "0.7.7",
+  "version": "0.7.8",
   "author": "Artur Arseniev",
   "license": "BSD-3-Clause",
   "homepage": "http://grapesjs.com",

src/commands/view/Preview.js

@@ -17,6 +17,7 @@ module.exports = {
     if(sender && sender.set)
       sender.set('active', false);
     editor.stopCommand('sw-visibility');
+    editor.getModel().stopDefault();
     var that = this;
     var panels = this.getPanels(editor);
     var canvas = editor.Canvas.getElement();

src/panels/config/config.js

@@ -30,7 +30,6 @@ module.exports = {
       className: 'fa fa-eye',
       command: prv,
       context: prv,
-      stopDefaultCommand: 1,
       attributes: { title: 'Preview' },
     },{
       id: ful,